diff --git a/ubuntu/mastodon.zombocloud.com.yml b/ubuntu/mastodon.zombocloud.com.yml
index 870e028..c3bfdc1 100644
--- a/ubuntu/mastodon.zombocloud.com.yml
+++ b/ubuntu/mastodon.zombocloud.com.yml
@@ -25,8 +25,8 @@
         - error_log "/var/log/nginx/mastodon.zombocloud.com.error.log"
         - ssl_certificate "/etc/ssl/letsencrypt/mastodon.zombocloud.com.crt"
         - ssl_certificate_key "/etc/ssl/letsencrypt/mastodon.zombocloud.com.pem"
-        - add_header Strict-Transport-Security "max-age=31536000; includeSubDomains"
-        - add_header Referrer-Policy "no-referrer, strict-origin-when-cross-origin"
+        - add_header Strict-Transport-Security max-age=31536000; includeSubDomains
+        - add_header Referrer-Policy no-referrer, strict-origin-when-cross-origin
         - location / {
             try_files $uri @proxy;
           }